The problem is that the issues you've mentioned - Iraq, the Ports Deal, wiretapping, etc...are not "impeachable" offenses. After all - Congress approved Iraq. The Dubai deal was approved by a government committee. The Echelon wiretapping has been going on since Harry Truman initiated it, so that isn't anything new, either.

To be impeached, a President must be convicted of "high crimes and misdemeanors." All of the actions you've mentioned, while controversial, are by definition not enough to get him kicked out.

Besides - even if you do impeach him, that means Cheney is in the Oval Office. For liberals, that would probably be as unacceptable as having Jesse Helms in there. :p